Add an "lvglterm" configuration that runs the on-screen NuttShell terminal
(apps/examples/lvglterm, touch input variant) on the display: an on-screen
LVGL keyboard driven by the FT5X06 touchscreen feeds the shell and the NSH
output is rendered in an LVGL text area.
Update the apps/examples/lvglterm documentation to describe the two input
variants (on-screen touch keyboard and physical keyboard) and their
configuration options (input source, keyboard device and font choices).
Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>
7a4f270492